Carburetor



' Fell 1932 w. G. HEGINBOTTOM ET AL 1,845,710

I GARBURETOR Filed Jan. 25; 1924 Patented Feb. 16, 1932 UNITED STATESPATENT A OFFICE WALTER G. HEGINB OTTOK AND JACOB RICHARD UNIONINDUSTRIAL TRUST COMPANY AND FRANCIS, OF FLINT, IICHIGAN; THE ANNAHEGINBOTTOM EXEGUTOBS sun WALTER o. namno'r'rox, nacnasan caaauamroaApplication ma January as, 1924. semi! in. 600,052.

This invention relates to carburetors, the object being to provide anair valve which is interconnected with the throttle of the carburetorfor the pur ose of varying the vacuum in the mixing 0 amber at variousthr0t tle positions.

Another object of the invention is to provide means for varying thetension of the spring controlling the air valve in the form of a camcarried b the throttle valve stem and so constructed t at the tension ofthe spring is automatically increased when the throttle valve of thecarburetor is in substantially closed position or substantially fullopen position, whereby the mixture will be heavier when the internalcombustion engine is idl ng or running at hi h speed.

Another and urther object of the invention is to provide a constructionof carburetor and loading valve which can be manufactured cheaply, theparts bein so arranged and 1nterconnectcd that all anger of these partsgetting out of order when in operation are rcvented, additional meansbeing provided ior setting the air valve so as to obtain the properproportion of gas and 8.1! prior to the actuation of the means for adust1ng the tension of the air valve.

Other and further ob'ects and advantages of the invention will beereinafter set forth and the novel features thereof defined by the apended claims.

n the drawings,

Figure 1 is a side elevation of a carburetor, partly in section, showingthe application of our improved construction of means for varyin thetension of the air valve spring;

%igure 2 is a detail side elevation, partly in section, showing thethrottle valve partially open; and

Figure 3 is a similar view showing the throttle valve in full openposition.

In the embodiment of the invention as herein shown 1 indicates the bodyof a carburetor which is provided with a fuel bowl 2. anda fuel nozzle 3extending into the mixing chamher 4, which is provided with an outlet 5having a flange 6 of the usual construction connecting the same to theintake manifold of an internal combustion engine. The body is providedwith an air inlet 7 controlled by an air valve 8 provided with athreaded stem 9 on which is mounted an adjusting sleeve 10 in theopposite end of which is secured a bolt 11.

The flange 6 is provided with an extension 12 provided with a stud 13 onwhich is mounted a bell crank 14, the arm 15 of which is provided with aball 16 for the purpose hereinafter fully described. The arm 17 of thebell crank 14 is provided with a bifurcated bearing, in the furcation ofwhich is mounted the eye of a bolt 11 on a pin 19, whereb as the bellcrank 14 is rocked, the position 0 the air valve 8 will be adjusted inrespect to its seat.

The stem 9, sleeve 10 and bolt 11 form an adjustable connection betweenthe bell crank and the valve for adjusting the position of the valve inorder to get the proper proportion of gas and air.

Mounted within the upper end of the mixing chamber is a throttle valve20 carried by a stem 21 extending transversely through the walls of themixing chamber and provided with a cam 22 which is providedwith a lip 23and a lobe 24 for the purpose hereinafter fully described.

Arranged on theside of the body of the carburetor is a tubular casing 25provided with a bearing mounted on the throttle shaft at its inner endand supported at its outer end by the ball 16 of the arm 15 of the bellcrank 14 which is movably mounted in the casing, said casing beingprovided with a slot 26 through which the arm passes as clearly shown inFigure 1.

Disposed within the casin 25 is a coil spring 27 which engages the ba 116 at one end and a ball 28 at its opposite end, which is looselymounted within the casing. This end of the casing is contracted andslotted as shown at 29 to receive the cam 22 and when the throttle is insubstantially closed position, the lip 23 of the cam is in contact withthe ball 28 so as to increase the tension of the spring in order toresist the opening of the air valve 8 so as to increase the vacuumwithin the mixing chamber of the carburetor.

The valve stem 21 is provided with the usual operating lever and isadapted to be connected to the controlled means in the usual manner andas the throttle valve is moved into position as shown in Figure 2, thetension of the spring is reduced so as to weaken the mixture atintermediate speeds. As the throttle-valve is moved into full openposi-' tion, the-lobe 24 of the cam forces the ball 1 "economical range,say from 10 miles an hour to 50 m1les an hour, it is essential toPIOVldQ means for supplying a rich mixture to the internal combustionengine at idling speed and full speed anda lean mixture at intermediatespeed, and by the particular. cons struction of automatic control of thetension engines comprising a body provided with a mixing chamberand a.valvecontrolled air I inlet, a bellgcrank mounted on said body, an

of the spring by the movement of the throttle, we are able to'accomplishthisresult.

By having an independent adjustment for the air valve, we are able toadjust the same independent of the movement of the throttle so as to setthe instrument and. while we have shown certain details of constructionof air valve and means for-adjustingthe same, we are aware that variouschanges can be made without departing from the spirit ofour invention,which consists broadly in providing a means for adjusting the tension ofthe air valve spring at different throttle positions. What weclaim i's:-r a 'lxA carburetorfor internal combustion adjustableconnection'betw'een one arm of Stud bell crank and said air valve, a sring bearmgagainst the other arm of sai bell crank, a throttle valvemountedin said body and a cam 'carried'bysaid throt'tle valve forincreasing the com ressionof said spring at high and low spee sand fordecreasing the compression of said spring at intermediate speed. p p 72. A carburetor comprising a body provided with a mixing chamber havinga throttle valve for controlling the outlet and an air valve forcontrolling an airinlet therefor, a

of said spring at high and low speeds and for decreasing the compressionof said spring at intermediate speed.

3. A carburetor comprising a body provided with a mixing chamber havin athrottle valve controlling the outlet, said ody being provided with avalve controlled air inlet, a bell crank mounted on said body and an adjustableconnection between said bell crank and said air valve, a casingcarried b the throttle shaft in which one end of sai bell crankdisposed, a spring arranged in said casing adjacent said bell crank, aball arranged in said casing engaging the other end of said spring'and acammounted on the throttle valve engaging said ball and so consti'uctedthat the compression of said spring is increased at high and low speedsand reduced at intermediate speed for varylng the vacuum within saidmixing chamber.

4. A carburetor for internal combustion engines having'a mixing chamberprovided with a throttle valve controlling the outlet thereof and an airinlet and air valve therefor, a spring disposed within a casing fornormally holding said air valve in a predetermined position,va balldisposed in said casing engaging said spring and a cam carried by thethrottle valve for increasin the compression of said, spring at high anlow speeds and reducing the compression of said spring at intermediatespeeds .for varying the vacuum within said mixing chamber.

In testimony whereof we hereunto atfix our signatures.

WALTER- G. HEGINBOTTOM. JACOB RICHARD FRANCIS.

bell crank mounted on said body having a a mounted there-in engaging oneof the arms connection with said air valve, a casing mounted'on thethrottle'sh'aft having a spring of said bell crank, a ball arranged atthe other end of said spring within said'casing and a cam mounted on thethrottle valve having a lip and a lobe for increasing the compression

